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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 7:16 pm CDT Apr 29, 2026
 
Tonight

Tonight: A 20 percent chance of showers before 10pm.  Partly cloudy, with a low around 39. North northeast wind 5 to 10 mph becoming west northwest after midnight. Winds could gust as high as 15 mph.
Slight Chance
Showers then
Mostly Clear
Thursday

Thursday: A 20 percent chance of showers after 4pm.  Mostly sunny, with a high near 55. Northwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 15 mph.
Mostly Sunny
then Slight
Chance
Showers
Thursday
Night
Thursday Night: A 20 percent chance of showers before 1am.  Patchy frost after 5am.  Otherwise, partly cloudy, with a low around 38. East northeast wind 5 to 10 mph becoming north northwest after midnight.
Slight Chance
Showers

Friday

Friday: A 20 percent chance of showers after 1pm.  Patchy frost before 7am.  Otherwise, partly sunny, with a high near 51. North wind 5 to 10 mph, with gusts as high as 15 mph.
Patchy Frost
then Slight
Chance
Showers
Friday
Night
Friday Night: Patchy frost after 4am.  Otherwise, partly cloudy, with a low around 37. East northeast wind around 5 mph becoming calm  in the evening. Winds could gust as high as 10 mph.
Partly Cloudy
then Patchy
Frost
Saturday

Saturday: Areas of frost before 8am.  Otherwise, mostly sunny, with a high near 54.
Areas Frost
then Mostly
Sunny
Saturday
Night
Saturday Night: Partly cloudy, with a low around 41.
Partly Cloudy

Sunday

Sunday: Mostly sunny, with a high near 66.
Mostly Sunny

Sunday
Night
Sunday Night: A chance of showers before 1am.  Mostly cloudy, with a low around 47.
Chance
Showers

Lo 39 °F Hi 55 °F Lo 38 °F Hi 51 °F Lo 37 °F Hi 54 °F Lo 41 °F Hi 66 °F Lo 47 °F

Hazardous Weather Outlook
 

Tonight
 
A 20 percent chance of showers before 10pm. Partly cloudy, with a low around 39. North northeast wind 5 to 10 mph becoming west northwest after midnight. Winds could gust as high as 15 mph.
Thursday
 
A 20 percent chance of showers after 4pm. Mostly sunny, with a high near 55. Northwest wind 5 to 10 mph becoming north northeast in the afternoon. Winds could gust as high as 15 mph.
Thursday Night
 
A 20 percent chance of showers before 1am. Patchy frost after 5am. Otherwise, partly cloudy, with a low around 38. East northeast wind 5 to 10 mph becoming north northwest after midnight.
Friday
 
A 20 percent chance of showers after 1pm. Patchy frost before 7am. Otherwise, partly sunny, with a high near 51. North wind 5 to 10 mph, with gusts as high as 15 mph.
Friday Night
 
Patchy frost after 4am. Otherwise, partly cloudy, with a low around 37. East northeast wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Saturday
 
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 54.
Saturday Night
 
Partly cloudy, with a low around 41.
Sunday
 
Mostly sunny, with a high near 66.
Sunday Night
 
A chance of showers before 1am. Mostly cloudy, with a low around 47.
Monday
 
Partly sunny, with a high near 68.
Monday Night
 
Mostly cloudy, with a low around 45.
Tuesday
 
Mostly sunny, with a high near 66.
Tuesday Night
 
A chance of showers. Mostly cloudy, with a low around 49.
Wednesday
 
A chance of showers. Partly sunny, with a high near 66.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
582
FXUS63 KLOT 300001
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
701 PM CDT Wed Apr 29 2026

.KEY MESSAGES...

- Cooler daytime temperatures, afternoon showers, and chillier
  nights through the end of the week

- Patchy frost possible tonight and Friday morning, with the
  potential for widespread frost Saturday morning.

- Warmer and wetter conditions potentially late in the weekend.

&&

.DISCUSSION...
Issued at 149 PM CDT Wed Apr 29 2026

A 500 mb long wave trough over the upper Midwest will become a
closed low overnight over southern Ontario and gradually move
east through Saturday. Embedded shortwaves within the upper
level troughing will provide occasional opportunities for
showers this afternoon through Friday. Cloud cover this
afternoon has limited daytime heating, but with an area of
convergence near the lake due to the onshore winds, spotty
showers are possible through the early evening, but will diminish
quickly after sunset. Temperatures will fall into the 30s
overnight. If winds decouple enough along with the decreased
cloud cover tonight, patchy frost is possible tomorrow morning.

The wave is expected descend southward within the upper level
pattern on Thursday afternoon. While the entire forecast area
has a slight chance of a shower tomorrow, hi-res models are
suggesting a slightly more southerly track to the wave leaning
higher chances south of I- 80 tomorrow. Persistent northerly
winds will continue to filter in cooler air to the region. As
skies clear out again and winds diminish, there is another
chance for patchy front Friday morning.

Guidance suggests yet another wave to descend down through the
pattern on Friday providing another chance for showers Friday
afternoon. The coldest air is expected to arrive overnight for
probably the best chance for widespread frost to develop
Saturday morning.

Weak ridging moving in from the west should finally break the
string of shower chances and allow for a drier weekend. As winds
turn to the southwest, it should filter in a (relatively)
warmer air mass. It will not be a heat wave, but should help
bring temperatures back up a little and approach the low 60s by
Sunday. However, the next trough is expected to descend out of
Canada Sunday providing the next chance for rain. There is still
model disagreement on timing and location. With better forcing
and instability, there could be some thunder embedded with these
showers, but most guidance has the better instability to the
south. Warmer temperatures will stick around early next week
with another storm system potentially midweek.

DK

&&

.AVIATION /00Z TAFS THROUGH 06Z FRIDAY/...
Issued at 701 PM CDT Wed Apr 29 2026

Aviation forecast concerns for the 00Z TAFs:

- Few lingering spotty SHRA early this evening, then another
  chance of SHRA Thursday afternoon/evening. Patchy MVFR cigs
  possible in precip.

- NNE winds at ORD/MDW/GYY become NW/WNW overnight into
  Thursday, then E-ENE again Thursday afternoon.

Shower coverage has decreased markedly since mid-afternoon,
though a few spotty showers will remain possible across the
terminals early this evening as a mid-level trough moves across
the area. Have maintained a VCSH mention for this, though
coverage may be on the light side. Patchy MVFR cigs were noted
over/near Lake Michigan and into southeast WI at issuance time,
though are mainly affecting GYY with ORD/MDW just west/south of
more solid MVFR coverage. ORD/MDW are expected to remain
primarily VFR with a gradual decrease in overall cloud cover
overnight.

Surface winds will shift northwest at ORD/MDW/GYY later this
evening and remain so through Thursday morning. Another lake-
assisted wind shift to east-northeast is expected early-mid
Thursday afternoon however. This will about coincide with
increasing rain shower chances which will develop from west-east
across the terminals in association with another approaching
mid-level disturbance. Highest coverage of showers looks to be
from mid-afternoon into early Thursday evening, then decreasing
beyond that time. Patchy MVFR ceilings will be possible mainly
in precipitation during that time.

Ratzer

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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